JP4928720B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator having a quick freezing mode for rapidly cooling a freezing room.

Conventionally, when you want to freeze food quickly or to make ice quickly, you can turn on the quick freezing switch on the door surface to turn on the compressor and the fan in the refrigerator more than usual. Refrigerators equipped with a quick freezing mode for rapidly cooling the specification switching room (freezing storage room) when the number of rotations is increased and the freezing room, ice making room or freezing temperature zone is set are on the market (For example, patent document 1).
JP 2004-3867 A

  However, in recent years, due to the improvement in the freezing capacity, when the quick freezing mode is used, the freezer compartment is cooled to a low temperature, for example, about −30 to −40 ° C. May occur. In this case, if the compressor is in operation, the high-temperature refrigerant flows through the dew-proof pipe embedded in the outer wall, and the outer wall becomes a high temperature, for example, 20 ° C. or higher, so that the occurrence of condensation can be prevented. . However, after the quick refrigeration mode is completed, the operation proceeds to a normal cooling operation, and the compressor is stopped until it reaches the ON temperature of the compressor, for example, -18 ° C. It takes a long time for the room temperature to reach the ON temperature of the compressor after cooling to about ℃, and the outer wall of the cabinet becomes low temperature, for example, less than 20 ℃ due to heat leakage from the room, thus avoiding the occurrence of condensation It was something that could not be done.

  Moreover, in the defrost mode in which the defrost heater is energized to defrost the cooler, the compressor is generally stopped. Therefore, when the defrost start timing is reached during the quick freeze mode, the quick freeze Immediately after the end of the mode operation or simultaneously with the timing, the defrosting mode is entered. In this case, the temperature in the storage room gradually rises due to defrosting, but as described above, the temperature drop of the cabinet outer wall due to the stoppage of the compressor is faster, so there is a risk that condensation will occur due to the cabinet outer wall becoming cold. It was.

  Further, when the quick freezing mode is canceled during the operation by the user's operation, the mode is generally shifted to the normal cooling mode. However, if the storage room temperature is equal to or lower than the compressor OFF temperature, as described above. However, it took a long time for the compressor to stop and reach the ON temperature, and as a result, there was a risk of condensation on the outer wall of the cabinet.

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a refrigerator capable of preventing condensation of a cabinet even when a quick freezing mode is employed.

In order to solve the above-mentioned problems, a refrigerator according to the present invention includes a cabinet provided with a freezer storage chamber, a condenser, a dew-proof pipe embedded in the cabinet to prevent dew condensation on the outer wall, and cooling for cooling the freezer storage chamber. A variable speed compressor that causes a refrigerant to flow through a refrigeration cycle connected to a cooler, and a defrost heater that defrosts the cooler, and the compression is performed at a predetermined timing based on an accumulated operation time of the compressor. opportunity of by stopping supplying an electric current to the defrosting heater, a defrosting mode for defrosting the cooler, the quick freezing mode for rapidly cooling the freezer compartment to the compressor by operating at high speed, the quick comprising the compressor after completion of the freezing mode and a condensation prevention mode for operating at low speed, when reached to the predetermined timing during the rapid freezing mode and the dew condensation preventing mode, the binding With shifts after ending prevention mode to the defrosting mode, before moving to the defrosting mode, the refrigeration storage compartment temperature detecting whether more than a predetermined temperature, the compressor if the predetermined temperature or higher The machine is operated at a high speed to shift to a pre-cooling operation for rapidly cooling the refrigerated storage chamber, and thereafter, the system is shifted to the defrosting mode .

  According to the above invention, even if the refrigeration storage room is in a low temperature state after the operation of the quick freezing mode, the outer wall of the cabinet is warmed by flowing the high-temperature refrigerant through the dew-proof pipe by forcibly rotating the compressor. The defrosting mode is capable of preventing the occurrence of condensation and shifting to the defrosting mode after the condensation prevention mode ends even when the defrosting start timing is reached during the quick freezing mode and the condensation prevention mode. Therefore, even if the compressor is stopped, it will be after the condensation prevention mode operation is finished, so that it is possible to reliably prevent the occurrence of condensation.

  An embodiment of the present invention will be described. As shown in FIG. 5 which is a longitudinal sectional view of the refrigerator according to the present invention, the refrigerator main body 1 is a refrigerated storage chamber in order from the top in a cabinet 2 filled with a heat insulating material between an outer box and an inner box. The refrigerator room 3, the vegetable room 4, the freezing room 6 that is a freezing storage room, and the specification switching room 5 that becomes a freezing storage room when the set temperature is changed to the freezing temperature zone are configured. Although not particularly shown, an ice making room which is a freezing storage room is provided on the side of the specification switching room 5. The front opening of the main body 1 is provided with doors 7 to 10 that sequentially close the storage chambers 3 to 6 in an openable manner.

  The refrigerator compartment 3 and the vegetable compartment 4 are partitioned by a partition plate 11, and each of the refrigerator compartment 3 and the vegetable compartment 4 is approximately 1 to 5 based on the temperature detected by a refrigeration temperature sensor 54 (hereinafter referred to as R sensor) attached to the back of the refrigerator compartment 3. In the temperature range. A refrigeration cooler 46 (hereinafter referred to as “R EVA”) is provided on the back surface of the refrigerator compartment 3, and a refrigeration fan 18 (hereinafter referred to as “R fan”) is provided above the refrigerator. When the R fan 18 is rotated, the cold air generated by the R EVA 44 is supplied to the refrigerating room 3 to cool the room, and the vegetable room 4 is cooled, and the cooled air is returned to the R EVA 46 again. To be cooled.

  On the other hand, the specification switching chamber 5, the freezing chamber 6 and the ice making chamber are partitioned by a heat insulating partition wall 16, and the freezing chamber 6 is detected by a freezing temperature sensor 55 (hereinafter referred to as F sensor). Therefore, the specification switching chamber 5 is controlled to be maintained in various set temperature ranges. On the back surfaces of the specification switching chamber 5 and the freezer compartment 6, there is provided a freezer compartment evaporator 48 (hereinafter referred to as "F EVA") whose evaporation temperature is set lower than that of the R evaporator 46, and in the upper part thereof, a freezer compartment fan. 19 (hereinafter referred to as F fan) is provided. When the F fan 19 is operated, the cold air generated by the F EVA 48 is supplied to the specification switching chamber 5 and the ice making chamber or the freezer compartment 6 to cool the chambers. It is supposed to be cooled by. Further, the F eva 48 is provided with a defrost heater 20 including a pipe heater that performs defrost.

  The vegetable room 4, the specification switching room 5 and the ice making room are partitioned by a heat insulating partition wall 17, and the refrigeration room 3 and vegetable room 4, the specification switching room 5, the ice making room and the freezing room 6 are respectively cooled. The flow is made independent.

  A machine room 30 is provided at the bottom of the back surface of the main body 1, a variable speed compressor 41, a condenser 42, a heat dissipating fan 31 (hereinafter referred to as C fan) that radiates these, and an outside air temperature are detected. An outside air temperature sensor 53 is provided. A control device 50 is provided on the back of the machine room 30 to supply power to each electrical component and control it based on the detected temperatures of the outside air temperature sensor 53, the R sensor 54, the F sensor 55, and the like.

  An operation panel 13 is disposed at the lower front of the refrigerator compartment door 7, and in this embodiment, an operation start signal is output to the control device 50 by a pressing operation in this embodiment, and the operation panel 13 enters a quick freezing mode described later. A quick freezing switch 14 is provided. In addition, this mode is canceled by pressing again during the quick freezing mode.

A refrigeration cycle 40 according to the present invention includes a condenser 42 that condenses refrigerant on the discharge side of the compressor 41, an outer wall of the cabinet 2, here, a back surface, a side surface, a front surface, and a refrigerating cycle 40 according to the present invention, as shown in FIG. A dew-proof pipe 43 that is embedded over the front surfaces of the partition plate 11 and the heat insulating partition walls 16 and 17 and prevents condensation on the outer wall is disposed. A switching valve 44, which is a flow rate or flow path adjustment / switching device, is connected to the downstream side of the dew-proof pipe 43, and a freezing capillary tube 47 (hereinafter referred to as a refrigeration capillary tube 47) F
A tube connecting the F evaporator 48 and the accumulator 49 in order, and the other connecting a tube connecting the second capillary tube 44 (hereinafter referred to as the R capillary tube) and the R evaporator 46. ing. The outlet side pipe of the R evaporator is connected to the inlet side of the F evaporator 48, and the outlet side pipe of the accumulator 49 is connected to the suction side of the compressor 41.

  The outlet piping of the R evaporator 46 is provided with a refrigeration defrost sensor 51 (hereinafter referred to as RD sensor) for detecting the piping temperature of the R evaporator 46, and the accumulator 49 has an outlet piping temperature of the outlet F 48. Is provided with a defrosting sensor 52 for refrigeration (hereinafter referred to as FD sensor).

  Here, the normal cooling mode will be described. In the normal cooling mode, the R cooling mode and the F cooling mode are alternately switched to cool each chamber. In the R cooling mode, the detected temperature of the R sensor 54 is the ON temperature of the compressor 41, for example, 5 When the temperature rises to 0 ° C., the refrigerating room 3 and the vegetable room 4 are cooled by operating the switching valve 44 so that the refrigerant flows to the R EVA 46 side. On the other hand, in the F cooling mode, when the detected temperature of the F sensor 55 reaches the ON temperature of the compressor 41, for example, −18 ° C., the switching valve 44 is operated so that the refrigerant flows to the F EVA 48 side and the freezer compartment 6 and the like. Cool down. In addition, since it is necessary to cool the storage room being cooled to a minimum, even if the storage room that has not been cooled reaches the ON temperature, it may be in the F cooling mode for a predetermined time, for example, 20 minutes in the R cooling mode. For example, the cooling mode is not switched for 40 minutes.

  Specifically, in the R cooling mode, the R fan 18 is rotated to supply cold air to the refrigerator compartment 3, and the F fan 19 is stopped. In the F cooling mode, the F fan 19 is rotated to supply cold air to the freezer compartment 6 and the like, and the R fan 18 defrosts the R evaporator 44 so that the detected temperature of the RD sensor 51 becomes a predetermined temperature, for example, 3 ° C. Rotate until it reaches. In this way, the refrigeration chamber 3, the vegetable chamber 4, the switching chamber 5, the ice making chamber, and the freezing chamber 6 are maintained at appropriate temperatures by sequentially switching the R cooling mode and the F cooling mode alternately.

  In the compressor 41, the rotation frequency is determined based on the temperature difference between the set temperature of each chamber and the temperature detected by the R sensor 54 or the F sensor 55, and the storage chamber being cooled is set to the OFF temperature. If the storage room that has not reached cooling has reached the ON temperature, the rotation is stopped. The C fan 31 varies in rotation speed in synchronization with the rotation speed of the compressor 41, and stops when the compressor 41 stops.

  Next, the defrosting mode of F EVA 48 will be described. In the normal defrosting mode, a predetermined cooling operation cycle assuming that the cooling performance is deteriorated due to the frost formation of the F-evapor 48, for example, the accumulated operation time of the compressor 41 has passed 8 hours (hereinafter referred to as the “cooling performance”). The defrosting start timing is determined.) When the F cooling mode is finished, the normal cooling mode is shifted to. Immediately before the transition to the defrosting mode, in order to suppress the temperature rise of the freezer compartment 6 due to the defrosting, the end set temperature of the F cooling mode is lowered stepwise to force the freezer compartment 6 etc. Perform pre-cooling operation to cool down.

  In this precooling operation, the OFF temperature of the compressor 41 is gradually lowered, and finally the freezer compartment 6 is cooled to the precooling end temperature, in this case, −28 ° C. This precool end temperature suppresses adverse effects on food by lowering the room temperature at the start of the defrost mode even when the room temperature of the freezer compartment 6 or the like increases due to energization of the defrost heater 20. As such, the temperature is set by experiments.

  After shifting to the defrost mode, the defrost heater 20 is energized to perform defrosting. When the detected temperature of the FD sensor 52 reaches the defrost end temperature, for example, 10 ° C., the defrost heater 20 is deenergized. To cancel the defrost mode. Then, for the pressure balance of the refrigeration cycle, the compressor 41 is stopped until a predetermined time, for example, 6 minutes elapses, and a normal cooling mode is shifted.

  Next, the quick freezing mode will be described with reference to FIG. When the quick freezing switch 14 is operated, the quick freezing mode shifts immediately if it is in the normal cooling mode at the timing t0, and shifts after the defrosting mode ends if the defrosting mode or precooling operation is in progress. To do.

  In the quick freezing mode, in order to rapidly cool the food stored in the freezer compartment 6 or the like, the mode is changed to the F cooling mode, and the compressor 41 is rotated at a high speed, for example, the rotation frequency is 63 Hz regardless of the temperature in the storage compartment. Let it run. At this time, the F fan 19 and the C fan 31 are also rotated at a high speed, thereby increasing the supply of cool air and enhancing the heat dissipation effect to perform rapid cooling.

  During this cooling, if the room temperature of the refrigerator compartment 3 reaches the ON temperature, the refrigerator compartment 3 and the vegetable compartment 4 will become hot if the refrigerator storage room is continuously cooled. When the timing shifts to the R cooling mode to cool the refrigerated storage chamber and the storage chamber temperature reaches the OFF temperature, the timing shifts to the F cooling mode again at the timing of tb. In addition, even if it transfers to R cooling mode, the compressor 41 is made to drive | operate by high speed rotation, The temperature in a storage chamber is rapidly reached to OFF temperature, and is made to transfer to F cooling mode.

  The quick freezing mode is a preset time from the time of transition to this mode, for example, 120 minutes, or when a time set by the user has elapsed, or a temperature at which the room temperature of the freezer compartment 6 is preset, For example, when the temperature reaches −35 ° C., it is assumed that the room has been sufficiently rapidly cooled, and the operation is terminated.

  Next, the dew condensation prevention mode which is one embodiment of the present invention will be described. The dew condensation prevention mode consists of a first predetermined time and a second predetermined time, and is shifted to the timing of tc when the quick freezing mode is finished. In the first predetermined time, in this embodiment, 20 minutes The same control as in the cooling mode is performed.

  In general, even if the normal cooling mode is performed, after the quick freezing mode is finished, if the room temperature of the refrigerator compartment 3 has not reached the ON temperature, the freezer compartment 6 is below the OFF temperature. It is in a stopped state. For this reason, the temperature of the outer wall of the cabinet 2 is a dew temperature measured from an experiment or the like, here, it may drop to 20 ° C. or less due to heat leakage, and condensation may occur. Is executed.

In this case, unlike the normal F cooling mode, the compressor 41 is operated at a low speed, for example, a rotation frequency of 30 Hz.
After completion of the quick freezing mode operation, the refrigeration storage chamber is sufficiently cooled, so there is no need for further cooling, but if the compressor 41 is not rotated, the high-temperature refrigerant gas will not flow through the dew prevention pipe 43. For this reason, the outer wall of the cabinet 2 is not heated, but is cooled by heat leakage to cause dew condensation. Therefore, by forcibly rotating the compressor 41 and causing the refrigerant gas to flow through the dew prevention pipe 43, the cabinet 2 can be heated to prevent the occurrence of condensation. Moreover, useless supercooling can be prevented by rotating at low speed, and thus power saving can be achieved. Furthermore, by setting it to F cooling mode, even if it becomes supercooling, unlike the refrigerator compartment 3 and the vegetable compartment 4, a foodstuff does not freeze and a malfunction does not generate | occur | produce.

  Although the first predetermined time has not elapsed after completion of the quick freezing mode, the compressor 41 may be rotated at a low speed as described above to prevent condensation, but the outer wall of the cabinet 2 is in the quick freezing mode. Therefore, even if the compressor 41 is stopped, it takes some time for the outer wall temperature to decrease to the dew temperature. Therefore, by setting the first predetermined time shorter than the time until the outer wall temperature of the cabinet 2 measured from the experiment reaches the dew temperature, it is possible to surely prevent dew condensation and to prevent the first predetermined time. By not performing forced rotation of the compressor 41 at low speed, unnecessary cooling can be prevented and power saving can be achieved.

  On the other hand, the C fan 31 is stopped during the condensation prevention mode. As usual, when rotating in synchronization with the compressor 41, the condenser 42 and the compressor 41 are dissipated, so the temperature of the refrigerant gas flowing in the dew-proof pipe 43 decreases, and the outer wall of the cabinet 2 This is counterproductive for the purpose of heating. Therefore, by stopping the C fan 31, higher-temperature refrigerant gas can be caused to flow through the dew-proof pipe 43, and the occurrence of condensation can be prevented more reliably and effectively.

  If the outer wall temperature of the cabinet 2 cannot be reliably heated even after the first predetermined time and the second predetermined time have elapsed, the condensation prevention mode is again the same as te to tf and tf to g. Repeat control. That is, the outer wall of the cabinet 2 is reliably heated by operating the compressor 41 intermittently.

  In addition, the second predetermined time is measured by an experiment or the like based on the relationship between the temperature rise of the freezer storage room and the temperature of the cabinet 2 even when the compressor 41 is stopped. Here, it is 10 minutes.

  Accordingly, by releasing the dew condensation prevention mode after the second predetermined time has elapsed, it is possible to reliably prevent dew condensation, and if the compressor 41 is operated continuously at low speed, Even if the room temperature reaches the ON temperature, it is possible to prevent the problem that the room temperature is not cooled, and the subsequent cooling can be performed effectively.

  Next, an operation when there is a defrosting start timing during the quick freezing mode operation according to the present embodiment will be described. When there is a defrosting start timing (tj) during the quick freezing mode (tb to tc), if the user immediately shifts to the defrosting mode, the user feels uncomfortable such as the refrigerator does not cool, The quick freezing mode is continued because it is not possible to meet demands such as making ice quickly.

  However, if the mode is shifted to the defrosting mode immediately after the quick freezing mode is finished, the compressor 41 is stopped, so that the outer wall temperature of the cabinet 2 may fall below the dew temperature. Therefore, in the present invention, after the dew condensation prevention mode is executed as described above, the defrost mode is entered.

  Specifically, when the dew condensation prevention mode ends at the timing tg, the pre-cooling operation is started and the temperature is cooled to the pre-cool end temperature. Then, the defrosting mode is performed at the timing of th to perform the defrosting of the F-evapor 48, and when the detected temperature of the FD sensor 52 reaches the defrosting end temperature, the defrosting heater 20 is turned off to defrost. Cancel the mode. After that, although not particularly shown, the compressor 41 is stopped for a predetermined time due to the pressure balance of the refrigeration cycle, etc., and the mode is shifted to the normal cooling mode at the timing of ti.

  As described above, according to the present invention, when the timing for starting the defrosting is reached during the quick freezing mode, the defrosting prevention mode is ended and then the defrosting mode is entered. Even if the chamber 6 and the like are rapidly cooled, and then the defrosting mode is entered and the compressor 41 is stopped, the temperature drop of the cabinet 2 can be suppressed by the dew condensation prevention mode. Can be prevented.

  In this case, the same effect can be obtained by shifting to the defrosting mode when the dew condensation prevention mode is completed, not only in the quick freeze mode but also in the dew condensation start mode. Can play.

  Next, a second embodiment will be described with reference to FIG. In the present embodiment, when the defrosting start timing is reached during the quick freezing mode or the dew condensation prevention mode, after the dew condensation prevention mode is finished, the room temperature of the freezing storage room, in this embodiment the freezing room 6 is detected, The transition to the defrosting mode is changed based on the detected temperature.

  Specifically, at the timing tg when the dew condensation prevention mode ends, it is detected whether or not the detected temperature of the F sensor 55 is higher than a predetermined temperature, here, the precool end temperature. After performing the precool operation in the same manner as described above, the mode shifts to the defrosting mode.

  On the other hand, as shown in FIG. 2, if the temperature is lower than the precool end temperature, the frozen storage room is sufficiently cooled even if the defrosting mode is shifted to, so the adverse effect on the food as the defrosting temperature rises is suppressed. It can be assumed that it can be performed, and at the timing of tg, the pre-cooling operation is not performed as it is and the mode is shifted to the defrosting mode (tg to ti).

  According to the above-described invention, after the quick refrigeration mode is finished, whether or not to perform precooling before defrosting is determined based on the temperature of the refrigerated storage room after the condensation prevention mode is finished, so that the room is sufficiently cooled. In spite of this, it is possible to prevent unnecessary electric power consumption for precooling the storage room again. In addition, when the temperature in the frozen storage room is high, the precooling operation is surely performed and then the defrosting mode is entered, so that adverse effects on the food accompanying the increase in the internal temperature can be suppressed.

  Next, a third embodiment will be described with reference to FIG. In the present embodiment, when the operation is instructed to start the quick freezing mode by the user during the precool operation or the defrosting mode operation, the precooling operation or the defrosting mode is canceled and the quick freezing mode and the dew condensation prevention mode are set. After performing, it is the structure which performs a precool driving | operation or a defrost mode.

  Specifically, when the defrosting start timing (tj) is reached, the pre-cool operation is performed and the compressor 41 is rotated at a high speed. At this time, if there is an operation start command for the quick refrigeration mode by the pressing operation of the quick refrigeration switch 14 at the timing of t0, the precool operation is canceled and the quick refrigeration mode is entered.

  Then, after executing the quick freezing mode for a predetermined time (tc to tg), the dew condensation prevention mode is shifted to at the timing of tg so that the outer wall of the cabinet 2 does not become low temperature, as in the second embodiment. If the indoor temperature of the freezer compartment 6 is detected and the temperature is equal to or lower than the precooling end temperature, the precooling operation is not performed and the process proceeds to the defrosting mode.

  According to the above-described invention, when there is an operation start command in the quick freezing mode during the precool operation or the defrosting mode operation, the refrigerator 1 is not cooled due to a failure by immediately shifting to the quick freezing mode. It is possible to meet demands such as making ice making quickly without giving the user a mistake.

  Also, especially in the precool operation, the refrigeration storage chamber is cooled in the same manner as the quick freezing mode. Therefore, after the precooling operation and the defrosting mode operation are finished, the quick freezing mode is switched to the quick freezing mode. Since the refrigeration storage room has already been cooled by going to the pre-cooling operation or the defrosting mode first, the operation time of the compressor 41 by high rotation can be shortened, and the power can be saved.

  Next, a fourth embodiment will be described with reference to FIG. In the present embodiment, when a quick release mode operation cancel command is issued by the user during the quick freeze mode operation, the mode is shifted to the dew condensation prevention mode.

  Specifically, when the user enters the quick freezing mode at the timing t0, the control device 50 rotates the compressor 41 and the like at high speed to rapidly cool the freezing storage chamber.

  During this cooling, if there is a quick freezing mode operation release command from the quick freezing switch 14 at timing tk, the quick freezing mode operation is stopped. However, when the timing of tk is close to the end of the operation, the freezer compartment 6 is sufficiently cooled, and if it is shifted to the normal cooling operation as it is, it takes a long time until the room temperature reaches the ON temperature. In short, the outer wall temperature of the cabinet 2 may be low.

  Therefore, in the present embodiment, at the timing of tk when the command for canceling the quick freezing mode operation is issued, the dew condensation prevention mode (tk to tf) is shifted to, and thereafter, the normal cooling is shifted at the timing of tf.

  According to the above-described invention, even when the quick freezing mode is canceled halfway, the condensation prevention mode is performed and the outer wall of the cabinet 2 is heated, so that the occurrence of condensation in the cabinet 2 can be reliably prevented.

  In this case, if the room temperature of the freezer compartment 6 is a predetermined temperature, for example, −25 ° C. or higher, there is no risk of condensation even if normal cooling is performed as it is. It is preferable to shift to the normal cooling mode without performing the prevention mode.

  The above-described configuration is an embodiment of the present invention, and various changes can be made. The refrigeration cycle 40 is not limited to the configuration described in the present embodiment, but a so-called parallel cycle in which an R EVA 46 and an F EVA 48 are connected in parallel, a cycle using a two-stage compressor, or a single cooler. It may be a one-evaporation cycle for cooling the refrigerator compartment 3 or the freezer compartment 6. Further, the first predetermined time, the second predetermined time, the rotational speed of the compressor, the dew temperature, etc. are preferably changed as appropriate according to the form of the refrigerator, and also changed appropriately in relation to the outside air temperature. Is preferred.

  The present invention can be applied to various refrigerators equipped with a quick freezing mode.

It is a time chart which shows one Embodiment of this invention. It is a time chart which shows the 2nd Embodiment of this invention. It is a time chart which shows the 3rd Embodiment of this invention. It is a time chart which shows the 4th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the refrigerator of this invention. It is the schematic which shows the refrigerating cycle of the refrigerator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigerator main body 3 ... Refrigeration room 6 ... Freezing room 14 ... Rapid freezing switch 31 ... C fan 41 ... Compressor 42 ... Condenser 43 ... Dew prevention pipe 44 ... Switching valve 46 ... R EVA 48 ... F Eva 50 ... Control device

Claims (1)

A variable speed type in which a refrigerant flows through a refrigeration cycle in which a cabinet having a freezer storage chamber, a condenser, a dew pipe embedded in the cabinet to prevent dew condensation on the outer wall, and a cooler for cooling the freezer storage chamber are connected. A compressor, and a defrost heater for defrosting the cooler,
A defrost mode in which the compressor is stopped and the defrost heater is energized to defrost the cooler at a predetermined timing based on the accumulated operation time of the compressor, and the compressor is rotated at high speed. A quick refrigeration mode for operating and rapidly cooling the refrigeration storage chamber; and a dew condensation prevention mode for operating the compressor at a low speed after completion of the quick refrigeration mode,
When the predetermined timing has been reached during the quick freezing mode and the dew condensation prevention mode, the dew condensation prevention mode is terminated and then the defrost mode is entered.
Before shifting to the defrosting mode, it is detected whether or not the temperature of the refrigerated storage room is equal to or higher than a predetermined temperature. If the temperature is higher than the predetermined temperature, the compressor is operated at a high speed to rapidly cool the refrigerated storage room. To the pre-cooling operation to be performed, and then to the defrosting mode.

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